Chromospheric rotation. I - Dependence on the lifetime of chromospheric features

Details Chromospheric rotation. I - Dependence on the lifetime of chromospheric features Chromospheric rotation. I - Dependence on the lifetime of chromospheric features

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...61....9a&link_type=abstract

Solar Physics, vol. 61, Feb. 1979, p. 9-16. Consiglio Nazionale delle Ricerche

Physics

6

Angular Velocity, Atmospheric Physics, Chromosphere, Solar Atmosphere, Solar Spectra, Cross Correlation, Filtergrams, Luminous Intensity, Solar Limb, Solar Rotation

Scientific paper

The dependence of the rotation rate of chromospheric features on their lifetime is discussed. The angular velocity of short-lived emission features at chromospheric level has been determined by analyzing daily filtergrams in the Ca II K3 line. An accurate method of analysis has been developed in order to evaluate the average daily displacement of chromospheric tracers, by computing an 'average cross correlation' of chromospheric brightness features for consecutive days at constant latitude. This method yields the average rotation rate for short-lived K3 chromospheric features (lifetime at least 1 day). These results are compared with the determinations of the rotation rate of long-lived chromospheric features (lifetime at least 27 days) obtained by using the same kind of data. Long-lived tracers are rotating rigidly in years of declining activity, while short-lived ones rotate differentially. Short-lived chromospheric features rotate at the same rate as the chromospheric plasma; i.e., faster than the photospheric plasma.

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